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首页> 外文期刊>Materials Science and Engineering >Effect of tempering temperature and inclusions on hydrogen-assisted fracture behaviors of a low alloy steel
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Effect of tempering temperature and inclusions on hydrogen-assisted fracture behaviors of a low alloy steel

机译：回火温度和夹杂物对低合金钢氢辅助断裂行为的影响

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摘要

The tensile properties and fracture behaviors of the pre-charged hydrogen low alloy steel subjected to various tempering temperatures were investigated by slow strain rate tensile tests. Hydrogen was introduced into the samples by electrochemical method in 0.5 mol L~(-1) NaOH solution with 1 g L~(-1) CH_4N_2S for 24 h at room temperature (298 K). The results show that with an increase in tempering temperature, the resistance to hydrogen embrittlement increases. For the sample tempered at 200 ℃, hydrogen-assisted microcracks initiate at the lath boundaries and the interfaces between inclusions and matrix. Moreover, the void around the inclusion initiates at the matrix-inclusion interface and grows in the form of the interface decohesion for hydrogen free sample, while the void also starts at the interfaces and propagates into the steel matrix along vertical tensile stress direction in the presence of hydrogen. Fractography reveals that for hydrogen-charged samples, the crack originates from mixed O-Si-Al-Ca inclusions in the samples tempered at 200 ℃ and 400 ℃, while it is not located at inclusions in the sample tempered at 650 ℃.
机译：通过慢应变速率拉伸试验研究了预充氢低合金钢在不同回火温度下的拉伸性能和断裂行为。在室温（298 K）下，在0.5 mol L〜（-1）NaOH溶液和1 g L〜（-1）CH_4N_2S中，通过电化学方法将氢气引入样品中。结果表明，随着回火温度的升高，抗氢脆性增加。对于在200℃回火的样品，氢辅助微裂纹在板条边界和夹杂物与基体之间的界面处开始。此外，夹杂物周围的空洞始于基体-夹杂物的界面，并以无氢样品的界面解聚的形式增长，而空洞也从界面开始，并在存在时沿垂直拉伸应力方向传播到钢基质中氢。断口扫描显示，对于充氢样品，裂纹起源于在200℃和400℃回火的样品中混合的O-Si-Al-Ca夹杂物，而不是位于在650℃回火的样品中的夹杂物。

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  • 来源
    《Materials Science and Engineering》 |2017年第13期|359-369|共11页
  • 作者

    Xinfeng Li; Jin Zhang; Sicong Shen; Yanfei Wang; Xiaolong Song;

  • 作者单位

    State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, State University of New York, Stony Brook,NY 11794-2100, USA;

    State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    School of Chemical Engineering & Technology, China University of Mining and Technology, Xuzhou 221116, China;

    State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Hydrogen embrittlement; Inclusions; Tempering temperature; Fracture behaviors;

    机译：氢脆夹杂物回火温度;断裂行为;

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